Enhanced weak superconductivity in trigonal y - PtBi2

Datum

19.01.2024

Zeit

10:00 - 11:00

Sprecher

Dr. Pablo Pedrazzini

Zugehörigkeit

IFW Dresden

Sprache

en

Hauptthema

Materialien

Host

Rita Taubert

Beschreibung

Polymorphic PtBi2 has been identified as a main candidate to study novel electronic states in topological materials. The superconducting y-phase attracts especial interest as recent reports from surface-sensitive techniques find strong enhancement of SC when compared to Tc=0.6 K and μ0Hc2=0.06 T reported in bulk crystals. I will present our* first findings based on electrical resistivity measurements on a high-quality single crystal of y-PtBi2 grown in our Lab. We detect a SC state with a critical temperature Tc = 1.1 K, and an enhanced critical field μ0Hc2 ≳ 1.5 T with an unusual weak anisotropy. Both Tc and Hc2 are the highest reported so far in stoichiometric bulk samples at zero pressure. We currently interpret the asymmetric broadening of the resistive transition under field, along with a low critical current-density Jc ~ 40 A/cm2 at H = 0, as result of an inhomogeneous SC state in the sample. * J. Zabala et al., arXiv:2309.00105

Links

• Seminars at the IFW

Letztmalig verändert: 19.01.2024, 07:38:26